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The stacked mushroom-shaped (SMS) electromagnetic bandgap (EBG) unit cell and its design procedure are presented. The cell structure is suggested to reduce the cell size and overcome the problems of manufacturing mushroom-shaped EBG cells over a thick dielectric substrate for low-frequency and wideband applications. A comparison between the SMS cell and the conventional mushroom-shaped cell is introduced based on the achievable frequency bandgap. Moreover, a parametric study is performed to highlight both the electrical and mechanical advantages of the SMS EBG structure. Finally, a prototype of a packaged microstrip line is built to verify the characteristics learned from the numerical analysis. [ABSTRACT FROM AUTHOR]

We present a multifilament current method (MFCM) incorporated with generalized sheet transition condition (GSTC) to simulate 2-D cylindrical metasurfaces with arbitrary cross sections. The GSTC casts in the form of an impedance-type boundary condition to relate the tangential fields on two sides of a cylindrical metasurface. The MFCM is subsequently introduced and formulated by employing the GSTC. The doublet-current unit, including both electric and magnetic filamentary sources, is introduced in order to capture both co- and cross-polarized scattered and transmitted fields from the GSTC characterized cylindrical metasurfaces. Three illustrative examples are presented to validate the proposed simulation technique. The behaviors of filamentary sources in terms of scattered field singularities and the ill-conditioning issue of the constructed matrix are also discussed in detail. In comparison to existing numerical methods, the proposed technique has its merits on simplicity and conciseness. [ABSTRACT FROM AUTHOR]